| SL | Sub District/Taluk/Post Office | Pincode |
| 1. | Akkaraivattam B.O | 609604 |
| 2. | Ambagarathur S.O | 609601 |
| 3. | Dharmapuram B.O | 609602 |
| 4. | Karaikal Bazaar S.O | 609602 |
| 5. | Karaikal S.O | 609602 |
| 6. | Karaikal South S.O | 609602 |
| 7. | Karaikalmedu B.O | 609605 |
| 8. | Karaikoilpathu B.O | 609605 |
| 9. | Karukkangudi B.O | 609607 |
| 10. | Kottuchery S.O | 609609 |
| 11. | Kurumbagaram B.O | 609603 |
| 12. | Madagadi B.O | 609602 |
| 13. | Melakasakudi B.O | 609603 |
| 14. | Nallambal B.O | 609601 |
| 15. | Nallathur B.O | 609603 |
| 16. | Nedungadu S.O | 609603 |
| 17. | Neravy S.O | 609604 |
| 18. | Seithur B.O | 609601 |
| 19. | Sellur B.O | 609607 |
| 20. | Surakudi B.O | 609607 |
| 21. | T.R.Pattinam South B.O | 609606 |
| 22. | Thalatheru S.O | 609605 |
| 23. | Tirumalairayanpattinam S.O | 609606 |
| 24. | Tirunallar S.O | 609607 |
| 25. | Tiruvettakudi B.O | 609609 |
| 26. | Varichikudi B.O | 609609 |
| 27. | Vizhithiyur B.O | 609607 |